Assessing and adjusting for non-response in the Millennium Cohort Family Study

Corry, Nida H.; Williams, Christianna S.; Battaglia, Mike; McMaster, Hope Seib; Stander, Valerie A.

doi:10.1186/s12874-017-0294-8

BMC Medical Research Methodology

Table 1 Characteristics of Millennium Cohort participants and Family Survey response – included in final response propensity model

From: Assessing and adjusting for non-response in the Millennium Cohort Family Study

Characteristic	Prevalence of characteristics^a		Percent responding to Family Survey	P-value
Characteristic	Unweighted n	Prevalence	Percent responding to Family Survey	P-value
Total	28,603	100.00	34.3
Demographic, service, and administrative characteristics
Gender
Male	21,984	86.0	37.1	<0.0001
Female	6619	14.0	16.6
Age
17–24 years	12,378	48.3	31.0	<0.0001
25–29 years	10,797	35.5	37.5
30+ years	5428	16.2	37.1
Race/ethnicity
White, non-Hispanic	21,294	69.6	37.6	<0.0001
Black, non-Hispanic	2470	12.1	22.1
Hispanic	2602	10.8	29.1
Other	2237	7.5	30.2
Education
< High school completion/diploma	51	0.2	19.9	<0.0001
High school degree/GED/or equivalent	5477	24.2	29.8
Some college (including 2 years degree)	15,469	57.4	33.4
Bachelor’s degree	5414	14.1	41.9
Advanced degree	2192	4.1	46.7
Income
< $50,000	15,912	62.5	33.5	<0.0001
$50,000–$74,999	5799	18.4	37.2
$75,000+	4817	11.1	41.1
Missing	2075	7.9	24.2
Number of dependent children
None	12,664	44.6	32.2	<0.0001
One	7865	27.5	35.2
Two	5205	18.0	36.6
Three or more	2869	9.8	36.8
Component
Active duty	22,365	78.9	34.1	0.1408
Reserve/National Guard	6238	21.1	35.1
Service branch
Army	12,949	50.3	34.7	0.0001
Navy/Coast Guard	4698	17.1	35.7
Marine Corps	2649	15.3	34.4
Air Force	8307	17.4	31.6
Pay grade
Enlisted	23,505	91.0	32.8	<0.0001
Warrant/commissioned officer	5098	9.0	48.7
Deployment/combat
Not deployed	6276	19.5	31.3	<0.0001
Deployed, no combat	3357	10.7	33.7
Deployed, in combat	17,977	65.9	36.0
Deployed, combat unknown	993	4.0	21.4
Panel 4 survey completion
Complete	27,045	93.9	35.1	<0.0001
Partial	1558	6.1	20.8
Panel 4 respondent referred spouse
Yes	8319	28.9	64.5	<0.0001
No	20,284	71.1	22.0
Health behaviours
Average hours of sleep/day
<6 h	6848	27.76	32.2	<0.0001
6 h	8192	28.95	34.1
7 h	6939	21.53	39.2
8 h	4707	15.01	34.1
>8 h	1298	4.43	32.4
Missing	619	2.33	19.7
Description of usual activities
Sit during day and do not walk much	6581	20.5	35.2	<0.0001
Stand/ walk a lot, little lifting	11,052	37.5	32.9
Light loads, or climb often	7893	29.4	35.5
Heavy work	2499	10.3	36.8
Missing	578	2.2	20.5
Physical health indices
Body mass index
<25.0	10,612	34.3	33.7	<0.0001
25.0–29.9	13,710	49.5	35.3
30.0+	3893	14.9	33.9
Missing	388	1.3	14.7
Days unable to work due to illness/injury
None	16,622	58.2	34.4	<0.0001
1–5 days	6456	21.1	34.6
6–15 days	2196	7.9	32.9
16+ days	2657	10.4	35.7
Missing	672	2.4	25.0
Mental health indices
VR-36 mental component score
Lowest 15%	3611	14.1	31.6	<0.0001
Middle 70%	19,279	66.5	35.4
Highest 15%	4335	14.0	35.9
Missing	1378	5.3	22.6
Having no one to turn to when you have a problem
Not bothered	22,717	77.4	35.6	<0.0001
Bothered a little	3699	14.0	31.2
Bothered a lot	1674	6.8	29.8
Missing	513	1.8	18.5
Financial problems or worries
Not bothered	16,001	51.7	35.0	<0.0001
Bothered a little	8846	33.1	35.4
Bothered a lot	3314	13.6	30.7
Missing	442	1.6	18.2
Overall attitude about military service
Negative/somewhat negative	4773	17.3	32.8	<0.0001
Neither negative or positive	3713	13.7	30.7
Positive/somewhat positive	18,264	61.8	36.7
Missing	1853	7.12	23.4
Trauma
Stressful events since 2008
None	12,035	40.9	34.8	<0.0001
1 or 2	11,434	40.0	36.2
3 or more	3626	13.3	32.6
Missing	1508	5.9	21.1

^aUnless specified as "unweighted", all table values are weighted with the Normalized Adjusted Weight 1 [Design weight with raking adjustment for non-response to P4W1]

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